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(1/5)*(4*x-9) = 7 // - 7
(1/5)*(4*x-9)-7 = 0
1/5*(4*x-9)-7 = 0
1/5*(4*x-9)-7 = 0
4/5*x-44/5 = 0
4/5*x-44/5 = 0
4/5*x-44/5 = 0 // + 44/5
4/5*x = 44/5 // : 4/5
x = 44/5/4/5
x = 11
x = 11
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